Internet Explorer Fonts - Language Script Error

It's about my girlfriend's Vista based PC. It started displaying

Cyrillic characters on some web pages and also in dialog windows of

some installers just like the context menu of Winrar. The regional

settings in Control Panel are correct in all respect.

As of the default web browser (IE7) however, the Fonts (General Tab)

are set to

Cyrillic and it cannot be changed. I try to set it to Latin based but

this setting cannot be saved and the setting

(General>-appearance>Fonts>Language Script) remains Cyrillic whatever I

do. The subtitles (Hungarian) downloaded to movies are also displayed

incorrectly with Cyrillic Characters instead of Latin.

Is there way to resolve this issue? What went wrong with her Vista (x86

6001)

Please help!

--

raymundka